Flat brush



FIG. 1 is a perspective view of the flat brush of the invention;

FIG. 2 is a top view of the flat brush shown in FIG. 1;

FIG. 3 is a bottom view of the flat brush shown in FIG. 1;

FIG. 4 is a left side view of the flat brush shown in FIG. 1, the right side view being a mirror image thereof;

FIG. 5 is a front view of the flat brush shown in FIG. 1; and,

FIG. 6 is a rear view of the flat brush shown in FIG. 1. 

The ornamental design for a flat brush, as shown and described. 